The ANSI standard transformers

The ANSI standard transformers

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The ANSI standard transformers are made as hermetic, to be operated practically as maintenance-free. They are
characterized by:
- low level of losses,
- reinforced insulation system,
- new type of tap-changer with a gear-type drive, easy operated.
The range of transformer power is up to 4000 kVA at the nominal voltage of the primary winding up
to 35 kV. The transformers are manufactured with 6 HV voltage series: 1 kV, 10 kV, 20 kV, 25 kV, 30
kV and 35 kV. The rated voltage at the LV side can be up to 6300 V according to a specific customer
request (400 V and 420 V are standard).
The transformers are fully filled with non-inhibited oil, without a gas cushion under the transformer tank
cover (unless other design was agreed in contract). During operation, the oil volume change is
compensated by elastic corrugated tank walls. The corrugated walls are made of thin steel foil – as
a consequence, the walls are sensitive for mechanical stresses. That is why during transportation and
installation of the transformers special attention is recommended. The rules described in chapters
“Transport (General conditions)” and “Assembly and commissioning” have to be followed.
The ANSI standard transformers are distribution transformers, where the best materials, proved to be highly effective, the most up-to-date production technology and design, have been applied to provide the end-user with a product ensuring the highest professional satisfaction.